import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
public class Main {
public static void main(String[] args) throws Exception {
FileOutputStream fos = new FileOutputStream(new File("C:/Demo"));
BufferedOutputStream bos = new BufferedOutputStream(fos);
bos.write("this is a test".getBytes());
bos.flush();
bos.close();
}
}